阅读说明：本技术 一种具有360照明功能的荧光显微镜及其方法 (Fluorescent microscope with 360 illumination function and method thereof ) 是由 陈从亮 于 2021-05-27 设计创作，主要内容包括：本发明公开了显微镜技术领域的一种具有360照明功能的荧光显微镜及其方法,包括荧光显微镜本体,所述荧光显微镜本体的底部设置有固定槽,所述固定槽的底部设置有底板,所述底板的底部四周处均设置有通槽,所述固定槽的前后两侧均滑动连接有两组结构相同的滑块,左右两侧的两组所述滑块相对侧均连接有直角梯形块,两组所述直角梯形块的顶部均设置有齿条架,两组所述齿条架的底端均啮合连接有齿轮,两组所述齿轮上均连接有转轴,所述转轴与电机的动力端连接,在驱动滚轮伸出和收回时,闭合机构上的挡板可以自动调整位置,从而便于覆盖住通槽,从而避免了外界杂质进入固定槽内与滚轮相接触,造成滚轮的使用寿命降低。(The invention discloses a fluorescence microscope with 360 illumination function and a method thereof in the technical field of microscopes, comprising a fluorescence microscope body, wherein the bottom of the fluorescence microscope body is provided with a fixed groove, the bottom of the fixed groove is provided with a bottom plate, the periphery of the bottom plate is provided with through grooves, the front side and the rear side of the fixed groove are respectively connected with two groups of sliders with the same structure in a sliding way, the opposite sides of the two groups of sliders on the left side and the right side are respectively connected with a right-angle trapezoidal block, the tops of the two groups of right-angle trapezoidal blocks are respectively provided with a rack, the bottom ends of the two groups of rack are respectively connected with a gear in a meshing way, the two groups of gears are respectively connected with a rotating shaft, the rotating shaft is connected with the power end of a motor, when a driving roller extends out and retracts, a baffle plate on a closing mechanism can automatically adjust the position, thereby being convenient to cover the through grooves, thereby avoiding external impurities from entering the fixed groove to contact with the roller, resulting in a reduction in the service life of the roller.)

1. A fluorescence microscope with 360 illumination function, comprising a fluorescence microscope body (1), characterized in that: the bottom of the fluorescence microscope body (1) is provided with a fixed groove (2), the bottom of the fixed groove (2) is provided with a bottom plate (3), the periphery of the bottom plate (3) is provided with through grooves (4), the front side and the rear side of the fixed groove (2) are respectively connected with two groups of sliders (5) with the same structure in a sliding manner, the opposite sides of the two groups of sliders (5) on the left side and the right side are respectively connected with a right-angle trapezoidal block (6), the tops of the two groups of right-angle trapezoidal blocks (6) are respectively provided with a rack (7), the bottom ends of the two groups of rack (7) are respectively connected with a gear (8) in a meshing manner, the two groups of gears (8) are respectively connected with a rotating shaft (9), the rotating shaft (9) is connected with the power end of a motor (10), the motor (10) is fixedly connected on a mounting seat (11), the mounting seat (11) is arranged on the fixed groove (2), two sets of equal roll connection in inclined plane of right angle trapezoidal piece (6) bottom has changes roller (12), it rotates and installs on roller frame (13) to change roller (12), both ends all are provided with gyro wheel (14) around roller frame (13) bottom, and gyro wheel (14) and logical groove (4) phase-match, and are two sets of the one end of keeping away from each other of roller frame (13) all is provided with leading truck (15), and leading truck (15) and fixed slot (2) sliding connection, the top of leading truck (15) all is provided with spring (16) of connection on fixed slot (2), and is two sets of the one end of keeping away from each other of right angle trapezoidal piece (6) all is provided with closing mechanism (17), and closing mechanism (17) cover on leading to groove (4).

2. A fluorescence microscope with 360 illumination function according to claim 1, characterized in that: the closing mechanism (17) comprises a first pushing assembly (171) connected to the right-angle trapezoidal block (6), the first pushing assembly (171) is connected with a second pushing assembly (172), and two groups of baffle plate assemblies (173) with the same structure are connected to the second pushing assembly (172).

3. A fluorescence microscope with 360 illumination function according to claim 2, characterized in that: the first pushing assembly (171) comprises a movable rod (1711) with one end hinged to a right-angle trapezoidal block (6), the other end of the movable rod (1711) is hinged to a sliding seat (1712), the sliding seat (1712) is connected to a fixing groove (2) in a sliding mode, and a second spring (1713) connected to the fixing groove (2) is arranged at the top end of the sliding seat (1712).

4. A fluorescence microscope with 360 illumination function according to claim 3, characterized in that: the second pushing assembly (172) comprises a connecting seat (1721) connected with the bottom of the sliding seat (1712), and two groups of connecting rods (1722) with the same structure are hinged to the connecting seat (1721).

5. The fluorescence microscope with 360 illumination function according to claim 4, wherein: baffle subassembly (173) include with connecting rod (1722) articulated fixing base (1731), the bottom fixed connection of fixing base (1731) is on baffle (1732), be provided with guide block (1733) on the outer wall of fixing base (1731), and guide block (1733) and bottom plate (3) sliding connection.

6. The fluorescence microscope with 360 illumination function according to claim 5, wherein: the baffle (1732) is provided with a through hole, the cross section area of the through hole is larger than that of the through groove (4), and the baffle (1732) covers the through groove (4).

7. The method of a fluorescence microscope with 360 illumination function according to any one of claims 1 to 6, wherein: the method comprises the following steps:

s1: when the fluorescence microscope body (1) needs to be moved, two groups of motors (10) are controlled to work, so that the left rotating shaft (9) drives the left gear (8) to rotate anticlockwise, the right rotating shaft (9) drives the right gear (8) to rotate clockwise, and then the two groups of right-angled trapezoidal blocks (6) are driven to move towards the directions away from each other through the two groups of rack frames (7);

s2: when the two groups of right-angle trapezoidal blocks (6) move towards the direction away from each other, the rotating roller (12) is extruded and rolls, and the rotating roller (12) drives the roller (14) to move downwards through the roller frame (13) along with the continuous movement of the right-angle trapezoidal blocks (6);

s3: when two groups of right-angle trapezoidal blocks (6) move towards the direction far away from each other, the movable rods (1711) on the two sides push the sliding seats (1712) to move downwards, so that the springs (1713) extend, the connecting seats (1721) push the fixing seats (1731) to move through the connecting rods (1722), under the guidance of the guide blocks (1733), the baffles (1732) move on the through grooves (4), the baffles (1732) are not covered on the through grooves (4), the through holes of the baffles (1732) are just positioned above the through grooves (4), the baffles (1732) and the rollers (14) all move continuously along with the continuous movement of the right-angle trapezoidal blocks (6), and the rollers (14) can sequentially extend out of the through holes and the through grooves (4) to the lower part of the bottom plate (3), so that the fluorescence microscope body (1) can be pushed;

s4: promote fluorescence microscope body (1) to required position after, make two sets of right angle trapezoidal pieces (6) move towards the direction that is close to each other, and then through the elasticity of spring (16), make gyro wheel (14) successively follow logical groove (4) and through-hole through withdrawing again, when gyro wheel (14) are withdrawed, through the elasticity of spring two (1713), make baffle (1732) also reset, thereby withdraw to initial position at gyro wheel (14), when fixed slot (2) is inside promptly, baffle (1732) cover logical groove (4) just, thereby avoided external impurity to contact with gyro wheel (14) in getting into fixed slot (2).

Technical Field

The invention relates to the technical field of microscopes, in particular to a fluorescence microscope with a 360-degree illumination function and a method thereof.

Background

The fluorescence microscope uses ultraviolet as a light source to irradiate an object to be detected and enable the object to emit fluorescence, and then the shape and the position of the object are observed under the microscope, the existing fluorescence microscope with 360-degree illumination function adopts a 360-degree illumination ring to generate enhanced dark field contrast, so that a focal plane can be easily found when a microscope device observes cells and regions, and the microscope device is convenient to use, but because the fluorescence microscope has a larger volume, a telescopic roller is generally installed at the bottom of the fluorescence microscope device to facilitate transportation, when the fluorescence microscope device needs to be moved, the roller extends out of a base of the fluorescence microscope, when the fluorescence microscope device needs to be fixed, the roller is retracted into the base of the fluorescence microscope, a through groove for the roller to pass through needs to be arranged at the bottom of the base, when the roller is not used, external impurities can enter the base to contact with the roller, and the service life of the roller is reduced, to this end, we propose a fluorescence microscope with 360 illumination and method thereof.

Disclosure of Invention

The present invention is directed to a fluorescence microscope with 360 illumination and a method thereof, which solves the above problems.

In order to achieve the purpose, the invention provides the following technical scheme: a fluorescence microscope with a 360-degree illumination function comprises a fluorescence microscope body, wherein a fixing groove is formed in the bottom of the fluorescence microscope body, a bottom plate is arranged at the bottom of the fixing groove, through grooves are formed in the periphery of the bottom plate, two groups of sliders with the same structure are connected to the front side and the rear side of the fixing groove in a sliding mode, right-angled trapezoidal blocks are connected to the opposite sides of the two groups of sliders on the left side and the right side, racks are arranged on the tops of the two groups of right-angled trapezoidal blocks, gears are meshed and connected to the bottoms of the two groups of racks, rotating shafts are connected to the two groups of gears and connected with power ends of motors, the motors are fixedly connected to mounting seats, the mounting seats are arranged on the fixing groove, rotating rollers are connected to inclined surfaces of the bottoms of the two groups of right-angled trapezoidal blocks in a rolling mode and are rotatably mounted on roller racks, the roller frame is characterized in that rollers are arranged at the front end and the rear end of the bottom of the roller frame, the rollers are matched with the through grooves, and the roller frame is two groups of rollers, one ends, away from each other, of the roller frame are provided with guide frames, the guide frames are connected with the fixing grooves in a sliding mode, the top of each guide frame is provided with a first spring connected to the fixing groove, the right-angled trapezoid blocks are two groups of springs, one ends, away from each other, of the right-angled trapezoid blocks are provided with closing mechanisms, and the closing mechanisms cover the through grooves.

Preferably, the closing mechanism comprises a first pushing assembly connected to the right-angle trapezoidal block, the first pushing assembly is connected with a second pushing assembly, and two groups of baffle assemblies with the same structure are connected to the second pushing assembly.

Preferably, one end of the pushing assembly is hinged to a movable rod on the right-angle trapezoidal block, the other end of the movable rod is hinged to a sliding seat, the sliding seat is connected to the fixed groove in a sliding mode, and a second spring connected to the fixed groove is arranged at the top end of the sliding seat.

Preferably, the second pushing assembly comprises a connecting seat connected with the bottom of the sliding seat, and two groups of connecting rods with the same structure are hinged to the connecting seat.

Preferably, the baffle assembly comprises a fixing seat hinged with the connecting rod, the bottom of the fixing seat is fixedly connected to the baffle, a guide block is arranged on the outer wall of the fixing seat, and the guide block is connected with the bottom plate in a sliding mode.

Preferably, the baffle is provided with a through hole, the cross section area of the through hole is larger than that of the through groove, and the baffle covers the through groove.

A method of a fluorescence microscope with 360 illumination function specifically comprises the following steps:

s1: when the fluorescence microscope body needs to be moved, the two groups of motors are controlled to work, so that the left rotating shaft drives the left gear to rotate anticlockwise, the right rotating shaft drives the right gear to rotate clockwise, and the two groups of right-angled trapezoidal blocks are driven to move towards the directions away from each other by the two groups of racks;

s2: when the two groups of right-angle trapezoidal blocks move towards the direction away from each other, the rotating roller is extruded and rolls, and the rotating roller drives the roller to move downwards through the roller frame along with the continuous movement of the right-angle trapezoidal blocks;

s3: when the two groups of right-angle trapezoidal blocks move towards the direction far away from each other, the movable rods on the two sides push the sliding seats to move downwards, so that the second springs extend, the connecting seats push the fixing seats to move through the connecting rods, the baffle plate moves on the through groove under the guiding of the guide blocks, the baffle plate is not covered on the through groove any more, the through hole of the baffle plate is just positioned above the through groove, the baffle plate and the roller wheel continue to move along with the continuous movement of the right-angle trapezoidal blocks, and the roller wheel can sequentially extend out of the through hole and the through groove to the position below the bottom plate, so that the fluorescence microscope body can be pushed;

s4: promote the fluorescence microscope body to the position of needs after, make two sets of right angle trapezoidal pieces remove towards the direction that is close to each other, and then the elasticity through spring one for the gyro wheel can be again successively from leading to groove and through-hole through withdrawing, when the gyro wheel withdraws, through the elasticity of spring two, make the baffle also reset, thereby withdraw to initial position at the gyro wheel, when the fixed slot is inside promptly, the baffle covers logical groove just, thereby has avoided external impurity to contact with the gyro wheel in getting into the fixed slot.

Compared with the prior art, the invention has the beneficial effects that: when the fluorescent microscope body needs to move, when the two groups of right-angle trapezoidal blocks move towards the direction far away from each other, the movable rod is enabled to push the sliding seat to move downwards, the spring II is enabled to extend, the connecting seat can push the fixing seat to move through the connecting rod, the baffle plate can move on the through groove under the guiding of the guiding block, the baffle plate is enabled not to cover the through groove any more, the through hole of the baffle plate is just positioned above the through groove, the baffle plate and the roller wheel can move continuously along with the continuous movement of the right-angle trapezoidal blocks, the roller wheel can extend to the lower part of the bottom plate from the through hole and the through groove, the fluorescent microscope body is pushed to the required position, the two groups of right-angle trapezoidal blocks move towards the direction close to each other, the roller wheel can retract from the through groove and the through hole again through the elastic force of the spring I, when the roller wheel retracts, the baffle plate also resets through the elastic force of the spring II, thereby withdraw to initial position at the gyro wheel, when the fixed slot is inside promptly, the baffle covers logical groove just to when drive roller stretches out and withdraws, the baffle on the closing mechanism can the automatic adjustment position, thereby be convenient for cover logical groove, thereby avoided external impurity to get into in the fixed slot and contacted with the gyro wheel, caused the life reduction of gyro wheel.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the inside structure of the fixing groove according to the present invention;

FIG. 3 is a partial schematic view of the present invention;

FIG. 4 is a schematic structural diagram of the present invention at A.

In the figure: 1. a fluorescence microscope body; 2. fixing grooves; 3. a base plate; 4. a through groove; 5. a slider; 6. a right-angled trapezoidal block; 7. a rack frame; 8. a gear; 9. a rotating shaft; 10. a motor; 11. a mounting seat; 12. rotating the roller; 13. a roller frame; 14. a roller; 15. a guide frame; 16. a first spring; 17. a closing mechanism; 171. a first pushing component; 1711. a movable rod; 1712. a sliding seat; 1713. a second spring; 172. a second pushing component; 1721. a connecting seat; 1722. a connecting rod; 173. a baffle assembly; 1731. a fixed seat; 1732. a baffle plate; 1733. and a guide block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A fluorescence microscope with 360 illumination functions, please refer to fig. 1 to 3, comprising a fluorescence microscope body 1, wherein the bottom of the fluorescence microscope body 1 is provided with a fixed groove 2, the bottom of the fixed groove 2 is provided with a bottom plate 3, the periphery of the bottom plate 3 is provided with through grooves 4, the front side and the rear side of the fixed groove 2 are respectively connected with two groups of sliders 5 with the same structure in a sliding way, the opposite sides of the two groups of sliders 5 on the left side and the right side are respectively connected with a right-angled trapezoidal block 6, the tops of the two groups of right-angled trapezoidal blocks 6 are respectively provided with a rack 7, the bottom ends of the two groups of rack 7 are respectively connected with a gear 8 in a meshing way, the two groups of gears 8 are respectively connected with a rotating shaft 9, the rotating shaft 9 is connected with the power end of a motor 10, the motor 10 is connected with the power end thereof through a speed reducer, the motor 10 is fixedly connected with a mounting seat 11, the mounting seat 11 is arranged on the fixed groove 2, the inclined planes at the bottoms of the two groups of right-angled trapezoidal blocks 6 are respectively connected with a rotating roller 12 in a rolling way, change roller 12 and rotate and install on roller frame 13, both ends all are provided with gyro wheel 14 around roller frame 13 bottom, and gyro wheel 14 and logical groove 4 phase-match, gyro wheel 14 can stretch out from leading to groove 4, the one end that two sets of roller frames 13 kept away from each other all is provided with leading truck 15, and leading truck 15 and fixed slot 2 sliding connection, the top of leading truck 15 all is provided with spring 16 of connection on fixed slot 2, spring 16 is used for changing reseing of roller 12, make to change roller 12 can always with right angle trapezoidal piece 6 rolling connection, the one end that two sets of right angle trapezoidal pieces 6 kept away from each other all is provided with closing mechanism 17, and closing mechanism 17 covers on leading to groove 4.

When the fluorescence microscope body 1 needs to be moved, two sets of motors 10 are controlled to work, so that the left rotating shaft 9 drives the left gear 8 to rotate anticlockwise, the right rotating shaft 9 drives the right gear 8 to rotate clockwise, then the two sets of right-angle trapezoidal blocks 6 are driven to move towards the directions away from each other through the two sets of racks 7, when the two sets of right-angle trapezoidal blocks 6 move towards the directions away from each other, the rotating roller 12 is extruded and rolled, along with the continuous movement of the right-angle trapezoidal blocks 6, the rotating roller 12 drives the roller 14 to move downwards through the roller frame 13, the closing mechanism 17 is opened, the closing mechanism 17 does not cover the through groove 4 any more, at the moment, the roller 14 can move downwards to pass through the through groove 4 and extend to the lower part of the bottom plate 3, after the fluorescence microscope body 1 is pushed to a required position, the two sets of right-angle trapezoidal blocks 6 move towards the directions close to each other, and then the elasticity of the first spring 16 is passed, the roller 14 can be withdrawn from the through groove 4 again, and after the roller 14 is withdrawn, the through groove 4 is covered again through the closing mechanism 17, so that the phenomenon that external impurities enter the fixing groove 2 to be in contact with the roller 14, and the service life of the roller 14 is shortened is avoided.

Example 2

A fluorescence microscope with 360 illumination functions, please refer to fig. 1 to 4, which comprises a fluorescence microscope body 1, wherein the bottom of the fluorescence microscope body 1 is provided with a fixed groove 2, the fixed groove 2 can be provided with a dust screen for dissipating heat of a motor 10, the bottom of the fixed groove 2 is provided with a bottom plate 3, the periphery of the bottom plate 3 is provided with through grooves 4, the front side and the rear side of the fixed groove 2 are respectively connected with two groups of sliders 5 with the same structure in a sliding manner, the opposite sides of the two groups of sliders 5 on the left side and the right side are respectively connected with a right-angle trapezoidal block 6, the tops of the two groups of right-angle trapezoidal blocks 6 are respectively provided with a rack 7, the bottom ends of the two groups of rack 7 are respectively connected with gears 8 in a meshing manner, the two groups of gears 8 are respectively connected with a rotating shaft 9, the rotating shaft 9 is connected with the power end of the motor 10, the motor 10 is connected with the power end thereof through a speed reducer, the motor 10 is fixedly connected with a mounting seat 11, the mounting seat 11 is arranged on the fixed groove 2, equal roll connection in inclined plane of 6 bottoms of two sets of right angle trapezoidal pieces has changes roller 12, change roller 12 and rotate and install on roller frame 13, both ends all are provided with gyro wheel 14 around roller frame 13 bottom, and gyro wheel 14 and logical groove 4 phase-match, the one end that two sets of roller frames 13 kept away from each other all is provided with leading truck 15, and leading truck 15 and 2 sliding connection of fixed slot, the top of leading truck 15 all is provided with spring 16 of connection on fixed slot 2, the one end that 6 mutual keeping away from of two sets of right angle trapezoidal pieces all is provided with closing mechanism 17, and closing mechanism 17 covers on leading to groove 4.

The closing mechanism 17 comprises a first pushing assembly 171 connected to the right-angle trapezoidal block 6, the first pushing assembly 171 is connected to a second pushing assembly 172, and two sets of baffle assemblies 173 with the same structure are connected to the second pushing assembly 172.

First drive assembly 171 includes that one end articulates the movable rod 1711 on right angle trapezoidal piece 6, and the other end of movable rod 1711 articulates there is sliding seat 1712, sliding seat 1712 sliding connection on fixed slot 2, and sliding seat 1712's top is provided with two 1713 of spring of connection on fixed slot 2, and two 1713 of spring are used for restoring to the throne of sliding seat 1712.

The second pushing assembly 172 includes a connecting seat 1721 connected to the bottom of the sliding seat 1712, and two sets of connecting rods 1722 having the same structure are hinged to the connecting seat 1721.

Baffle subassembly 173 includes fixing base 1731 with connecting rod 1722 is articulated, and the bottom fixed connection of fixing base 1731 is on baffle 1732, is provided with guide block 1733 on the outer wall of fixing base 1731, and guide block 1733 and bottom plate 3 sliding connection.

The baffle 1732 is provided with a through hole, and the cross-sectional area of the through hole is larger than that of the through groove 4, so that the roller 14 can pass through the through hole, and the baffle 1732 covers the through groove 4.

When the two groups of right-angle trapezoidal blocks 6 move towards the direction away from each other, the movable rods 1711 on the two sides push the sliding seats 1712 to move downwards, so that the springs 1713 extend, the connecting seats 1721 push the fixing seats 1731 to move through the connecting rods 1722, the baffles 1732 move on the through grooves 4 under the guidance of the guide blocks 1733, so that the baffles 1732 do not cover the through grooves 4 any more, at the moment, the through holes of the baffles 1732 are just positioned above the through grooves 4, the baffles 1732 and the rollers 14 all move continuously along with the continuous movement of the right-angle trapezoidal blocks 6, at the moment, the rollers 14 can sequentially extend out of the through holes and the through grooves 4 to the lower part of the bottom plate 3, after the fluorescence microscope body 1 is pushed to a required position, the two groups of right-angle trapezoidal blocks 6 move towards the direction close to each other, and then the rollers 14 can be retracted from the through grooves 4 and the through holes again through the elastic force of the springs 16, when the roller 14 withdraws, the baffle 1732 also resets through the elasticity of the second spring 1713, so that the roller 14 withdraws to the initial position, namely, when the fixing groove 2 is inside, the baffle 1732 just covers the through groove 4, so that when the driving roller 14 extends out and withdraws, the baffle 1732 on the closing mechanism 17 can automatically adjust the position, so that the through groove 4 is conveniently covered, thereby avoiding the external impurities from contacting the roller 14 in the fixing groove 2 and reducing the service life of the roller 14.

A method of a fluorescence microscope with 360 illumination function using the fluorescence microscope with 360 illumination function of embodiment 2, comprising the steps of:

s1: when the fluorescence microscope body 1 needs to be moved, the two groups of motors 10 are controlled to work, so that the left rotating shaft 9 drives the left gear 8 to rotate anticlockwise, the right rotating shaft 9 drives the right gear 8 to rotate clockwise, and then the two groups of right-angled trapezoidal blocks 6 are driven to move towards the directions away from each other through the two groups of rack frames 7;

s2: when the two groups of right-angle trapezoidal blocks 6 move towards the direction away from each other, the rotating roller 12 is extruded and rolled, and the rotating roller 12 drives the roller 14 to move downwards through the roller frame 13 along with the continuous movement of the right-angle trapezoidal blocks 6;

s3: when the two groups of right-angle trapezoidal blocks 6 move towards the direction away from each other, the movable rods 1711 on the two sides push the sliding seats 1712 to move downwards, so that the springs 1713 extend, the connecting seats 1721 push the fixing seats 1731 to move through the connecting rods 1722, and then under the guidance of the guide blocks 1733, the baffle 1732 moves on the through grooves 4, so that the baffle 1732 is not covered on the through grooves 4 any more, at the moment, the through holes of the baffle 1732 are just positioned above the through grooves 4, the baffle 1732 and the rollers 14 all move continuously along with the continuous movement of the right-angle trapezoidal blocks 6, at the moment, the rollers 14 can sequentially extend out of the through holes and the through grooves 4 to the lower part of the bottom plate 3, and then the fluorescence microscope body 1 can be pushed;

s4: after promoting fluorescence microscope body 1 to required position, make two sets of right angle trapezoidal pieces 6 remove towards the direction that is close to each other, and then through the elasticity of spring 16 for gyro wheel 14 can be successively from leading to groove 4 and through-hole again and pass through and withdraw, when gyro wheel 14 withdraws, through the elasticity of spring two 1713, make baffle 1732 also reset, thereby withdraw to initial position at gyro wheel 14, when fixed slot 2 is inside promptly, baffle 1732 covers logical groove 4 just, thereby has avoided external impurity to contact with gyro wheel 14 in getting into fixed slot 2.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.